Best Free MQTT Brokers of 2025

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Coreflux is a next-generation IoT platform that emphasizes seamless integration, scalability and security. At its core: MQTT Broker is the platform's backbone. It facilitates real-time data communication and management between devices, regardless of protocol or manufacturer. Flux DSL is a proprietary domain-specific programming language that allows users to create event-driven workflows and orchestrate sophisticated IoT scenarios. Asset Management (Flux Assets), Manages a wide range of IoT Assets, from sensors to databases. Ensures optimal configuration and performance. Coreflux's integrated tools allow for precise orchestration of devices, workflows and automations. Coreflux is a flexible IoT management platform that can be used by IoT enthusiasts, enterprises, and developers. It can manage a small number of devices or networks with thousands.

RabbitMQ is lightweight, portable, and easy to use on the premises or in the cloud. It supports multiple messaging protocols. RabbitMQ can both be deployed in distributed or federated configurations to meet high availability and scale requirements.

Pro Edition for Eclipse Mosquitto is a pro version of the world's #1 MQTT broker that quickly, stably, and reliably transmits data between IoT devices. Compared to the popular open-source version, Pro Mosquitto offers professional MQTT broker and client administration and monitoring, MQTT High Availability, MQTT and REST API access, improved reliability, enhanced security, and professional support, making it an ideal solution for commercial use. Benefits: Performance: Benefit from the low usage of computing resources and easily maintain up to 1 million concurrent connections. Pro Mosquitto is written in C, which makes it even more lightweight and efficient than competitors. In addition, it can run on very low-spec embedded devices, e.g., single-core 600MHz ARM and 128MB RAM. Reliable and trusted by the global dev community: The product is a pro version of the most popular open-source MQTT broker with more than 500 million docker pulls worldwide, powered by up to 99.99% SLA to ensure business continuity. Professional services and support: Our team can help you solve any issue, ensuring your project's successful implementation and maintenance. In addition, one can also request us to provide them with professional services

Solace is a specialist in Event-Driven-Architecture (EDA), with two decades of experience providing enterprises with highly reliable, robust and scalable data movement technology based on the publish & subscribe (pub/sub) pattern. Solace technology enables the real-time data flow behind many of the conveniences you take for granted every day such as immediate loyalty rewards from your credit card, the weather data delivered to your mobile phone, real-time airplane movements on the ground and in the air, and timely inventory updates to some of your favourite department stores and grocery chains, not to mention that Solace technology also powers many of the world's leading stock exchanges and betting houses. Aside from rock solid technology, stellar customer support is one of the biggest reasons customers select Solace, and stick with them.

HiveMQ is the most trusted enterprise MQTT platform, purpose-built to connect anything via MQTT, communicate reliably, and control IoT data. The platform can be deployed anywhere, on-premise or in the cloud, giving developers the flexibility and freedom they need to evolve as their IoT deployment grows. HiveMQ is reliable under real-world stress, scales without limits, and provides enterprise-grade security to meet the needs of organizations at any stage of digital transformation. The extensible platform provides seamless connectivity to the leading data streaming, databases, and data analytics platforms, plus offers a custom SDK for a perfect fit in any stack.

Tatsoft's FactoryStudio provides the tools you need to quickly design secure and powerful industrial applications. Features include real-time data modeling and data logging, MQTT client/spB broker/spB, audit trails, alarms & incidents, visual SQL query gateway, high-performance smart screens, HTML5 dashboards. WPF drawing tools. iOS app, trends, annotations, reporting & much more! Programming scripts can be done in C#, VB.NET or JavaScript. You can get up and running in no time with ZERO client install and just 2 minutes server side installation. It includes many native protocol drivers for PLCs, DCSs, as well as support for other industry standards like OPC, MQTT, and more. Are you looking for a driver that we don't yet have? We also have a toolkit to help you develop protocol drivers! FactoryStudio is your data hub for your industrial ecosystem. It can be your link between IT, OT, real-time devices and your SQL data sources.

MQTT Broker was created with passion to help you deploy and scale your IoT applications. REST API, dashboard, widgets, complete data storage & more. Quick snapshot of IoT devices with client disconnect and connection. The most important data is visualized using widgets on multiple dashboards. Alerts and coloured notations are available for different value-based triggers. Rules engine to transform MQTT messages for efficient M2M communication automation. Event- and timer-based rules to create actions and match data. Secure publish and subscribe messaging model with two layers of security for device communication. This includes SSL / TLS connectivity and device authentication with Username/ Password as an additional layer. Web security for data view. Multiple message brokers can be set up in Broker High availability mode to simultaneously collect and publish messages from multiple devices. This makes data collection possible with 99.99% success, regardless of the software.

Fogwing is the next-generation Industrial IoT platform. It has features that allow you to create IoT Solutions for a variety of industrial use cases, including asset tracking, predictive maintenance, and asset monitoring. Without needing to be an expert in information technology, users can create and deploy IoT-based automation solutions. Extended data analytics allows for data-driven analytical processes that predict operational risks and take action at lower TCO.

FairCom EDGE makes it easy to integrate sensor and machine data at their source - be that a factory, water treatment facility, oil platform, wind farm, or other industrial site. FairCom EDGE is the first converged IoT/Industrial IoT hub in the world. It unifies messaging and persistence with an all-in one solution. It also offers browser-based administration, configuration, and monitoring. FairCom EDGE supports MQTT, OPC UA and SQL for machine-tomachine (M2M), communication, and HTTP/REST for monitoring and real-time reporting. It constantly retrieves data from sensors and devices with OPC UA support and receives messages from machines with MQTT support. The data is automatically parsed and persisted, and made available via MQTT or SQL.

Cassandana, an open-source MQTT messaging broker written entirely in Java, is Cassandana. This project started as a fork in Moquette. Later, it was optimized and added additional features. It is now ready to be used as an enterprise message broker. To reduce I/O, supports In-memory cache mechanism. Supports In-memory cache mechanism to reduce I/O.

Mosca can be integrated into any Node.js application. You can run Mosca standalone by downloading the executable. Run it and connect to your preferred MQTT client. You will need to create a configuration file that contains the information broker in order to fully utilize mosca.

VerneMQ software is open-source, extensible, and offers enterprise support. VerneMQ, a distributed MQTT broker that is high-performance and highly efficient, is VerneMQ. It can scale horizontally or vertically on commodity hardware to support a large number of concurrent publishers and users while maintaining low latency, fault tolerance, and high performance. VerneMQ is the reliable messaging hub for your IoT platform and smart products. Mobile messaging services can be developed with a lower overhead than XMPP. You can create new mobile applications with low-latency bidirectional communication. Cities, Homes, Transportation. Mobile assets. VerneMQ can handle all your messages, from a small lab project to an industrial deployment. Monitor and control all devices in the field. Connect them to your backend services, data centers, and smartphone apps. VerneMQ will keep it all together.

MQTTnet is a high performance.NET library that supports MQTT-based communication. It supports MQTT protocol versions up to 5. It can be used with almost any supported.NET Framework version or CPU architecture. An optional message interceptor can also be added that allows for the transformation or extension of any received application message. Lightweight (only the low level implementation of MQTT is required, no overhead). Supports clients connected with different protocols at the same time.

The Datacake platform allows you to realize your Industrial IoT use case, including condition monitoring, data logs, real-time dashboards and data analytics. Connect LoRaWAN and NB-IoT devices to the platform. Use MQTT and other interfaces. Use Datacake IoT platform with Ready-to-Use LoRaWAN sensor to detect water levels in water containers, standing water, and other vessels. Modern online maps allow you to display the locations of your IoT assets (e.g. Interactive Maps allows you to see the locations of your IoT assets (e.g. sensors, machines, and other things) in real time. The map shows the historical route taken by these devices. Upload images and place sensors in the floor plan, hall plans, and other diagrams. It's easy to show your customers the conditions at-site. Datacake webhook allows you to send data to your devices. You can also find payload decoders to support HTTP requests here.

An essential part of any IoT project is a reliable MQTT broker. However, setting one up, managing, monitoring, and maintaining it can be time-consuming and complex. MQTTHQ is a multi-node, load-balanced MQTT broker cluster that provides a reliable broker for IoT products or applications. MQTTHQ supports both TCP connections and WebSocket connections. Important: MQTTHQ operates as a public broker. This means that any information sent via this broker can be seen by other users. Please do not send personal or private information via this public broker. We occasionally have to make changes, add new features, and improve the MQTTHQ public brokerage to ensure that it remains a free resource for IoT developers.

ZeroMQ (also known by OMQ or 0MQ or zmq), looks like an embedded networking library, but acts as a concurrency platform. It provides sockets that can carry atomic messages across multiple transports, including TCP, multicast, in-process, and inter-process. You can connect sockets N to N with patterns such as fan-out, pubsub, task distribution and request-reply. It is fast enough to be used as the fabric for clustered goods. Its asynchronous I/O allows you to build multicore applications that are scalable and can be used for asynchronous message processing tasks. It supports a number of language APIs and runs on all operating systems.

Eclipse Mosquitto (EPL/EDL licensed), is an open-source message broker that implements MQTT versions 5.0, 3.1 and 3.1.1. Mosquitto is a lightweight message broker that can be used on any device, from single board computers with low power to full servers. The MQTT protocol is a lightweight way to send messages using a publish/subscribe method. This makes it ideal for Internet of Things messages, such as low-power sensors or mobile devices like phones, embedded computers or Microcontrollers. The Mosquitto Project also provides a C Library for implementing MQTT Clients, as well as the very popular command line MQTT client mosquitto_pub.